Preparation and Characterization of Ca_(0.8)Sr_(0.2)ZrO_3 Powders Prepared by Soft Chemical Route

摘要

Precursors of calcium strontium zirconate (Ca_(0.8)Sr_(0.2)ZrO_3) were synthesized by oxalate copre-cipitation method. TG-DTA was used to characterize the thermal decomposition behaviors of the precursors. The XRD results revealed that the powders crystallized as cubic Ca_(0.8)Sr_(0.2)ZrO_3 with increasing heating temperature up to 1000°C. Calcium strontium zirconate ceramics were obtained under conventional sintering conditions by using the as-prepared Ca_(0.8)Sr_(0.2)ZrO_3 powders. The SEM micrographs of the ceramics sintered at 1450°C exhibited narrow grain-size distribution with the average grain size around 0.7 μm. The dielectric properties showed that, dielectric constant of the Ca_(0.8)Sr_(0.2)ZrO_3 was about 24.0 and dielectric loss was 0.002 at the frequency of IGHz and the room temperature.